20705020020 has 72 divisors (see below), whose sum is σ = 63392251104. Its totient is φ = 5469732288.

The previous prime is 20705020013. The next prime is 20705020031. The reversal of 20705020020 is 2002050702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20705019975 and 20705020002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518254 + ... + 556773.

It is an arithmetic number, because the mean of its divisors is an integer number (880447932).

Almost surely, 2^20705020020 is an apocalyptic number.

20705020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20705020020 is an abundant number, since it is smaller than the sum of its proper divisors (42687231084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705020020 is a wasteful number, since it uses less digits than its factorization.

20705020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075149 (or 1075144 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

Adding to 20705020020 its reverse (2002050702), we get a palindrome (22707070722).

The spelling of 20705020020 in words is "twenty billion, seven hundred five million, twenty thousand, twenty".